51234320 has 80 divisors (see below), whose sum is σ = 125087232. Its totient is φ = 19491840.

The previous prime is 51234299. The next prime is 51234343. The reversal of 51234320 is 2343215.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 51234292 and 51234301.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180899 + ... + 181181.

Almost surely, 2^51234320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51234320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62543616).

51234320 is an abundant number, since it is smaller than the sum of its proper divisors (73852912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51234320 is a wasteful number, since it uses less digits than its factorization.

51234320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400 (or 394 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 51234320 is about 7157.8153091568. The cubic root of 51234320 is about 371.4100565581.

51234320 divided by its sum of digits (20) gives a triangular number (2561716 = T₂₂₆₃).

Adding to 51234320 its reverse (2343215), we get a palindrome (53577535).

The spelling of 51234320 in words is "fifty-one million, two hundred thirty-four thousand, three hundred twenty".